mididocs:seq:blm16x16_build_guide
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mididocs:seq:blm16x16_build_guide [2016/03/28 21:12] latigid_on [Concept of the project] |
mididocs:seq:blm16x16_build_guide [2017/11/24 19:52] (current) latigid_on [Dimensions] |
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| * Pull-down resistors on current sink transistor bases (important when bases are floating and should decrease power consumption). | * Pull-down resistors on current sink transistor bases (important when bases are floating and should decrease power consumption). | ||
| * Schottky diodes from base to collector of current sink transistors. This helps to turn transistors "off" quicker and reduces "ghosting" in the matrix. | * Schottky diodes from base to collector of current sink transistors. This helps to turn transistors "off" quicker and reduces "ghosting" in the matrix. | ||
| - | * Output enable (/OE) delay implemented on pin 6 of 74HC595 chips. At power up the capacitor will charge, holding all outputs in a high impedance state until the +5V rail is stable. At power down this capacitor discharges through a pull down resistor, aided by a diode. One delay circuit is provided for each SCALAR section. | + | * Output enable (/OE) delay implemented on pin 13 of 74HC595 chips. At power up the series capacitor will charge, holding all outputs in a high impedance state to ensure all registers have been initialised. One delay circuit is provided for each SCALAR section. |
| For minimal external cabling, the BLM connects to a SEQ v4 via an 8-pin DIN connector. This combines MIDI in, MIDI out and power; the communications protocol sent and received by the BLM is standard MIDI. Most users will incorporate a Quad IIC board into their SEQ case, which is the simplest way to arrange the DIN8 connector, optocoupler and header pins. | For minimal external cabling, the BLM connects to a SEQ v4 via an 8-pin DIN connector. This combines MIDI in, MIDI out and power; the communications protocol sent and received by the BLM is standard MIDI. Most users will incorporate a Quad IIC board into their SEQ case, which is the simplest way to arrange the DIN8 connector, optocoupler and header pins. | ||
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| * LEDs are a little bit sensitive; don’t heat them for more than about 2 seconds at a time and apparently they don’t like static discharges... As far as I know, the humidity warnings you get with them are only really applicable to oven reflow soldering. | * LEDs are a little bit sensitive; don’t heat them for more than about 2 seconds at a time and apparently they don’t like static discharges... As far as I know, the humidity warnings you get with them are only really applicable to oven reflow soldering. | ||
| * Rev 1.1 boards have quite small ground plane isolation, and the soldermask is somewhat prone to scratching. Take extra care when soldering capacitors and ICs that you don't accidentally short the +5V rail, as this will make troubleshooting difficult. | * Rev 1.1 boards have quite small ground plane isolation, and the soldermask is somewhat prone to scratching. Take extra care when soldering capacitors and ICs that you don't accidentally short the +5V rail, as this will make troubleshooting difficult. | ||
| + | |||
| + | |||
| + | ==== Parts list ==== | ||
| + | |||
| + | The following parts are available from Mouser, you can try this shopping basket to save time. | ||
| + | |||
| + | [[http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=e31c510729]] | ||
| + | |||
| + | <code> | ||
| + | Quantity Recommended Description | ||
| + | Resistors | ||
| + | 660-MF1/4DC1002F 4 4 10k through hole | ||
| + | 652-CR1206FX-1002ELF 41 100 10k 1206 | ||
| + | 652-PTL45-15R0-103B2 4 4 10k slider, 15mm shaft, red LED | ||
| + | 652-PTL45-10G0-102B2 - - 1k slider, 10mm shaft | ||
| + | |||
| + | Resistor networks | ||
| + | 652-4816P-T2LF-10K 5 6 10k bussed (165 pullups) | ||
| + | 652-4816P-1LF-1K 5 6 1k isolated (current sinks) | ||
| + | 652-4816P-1LF-220 5 6 220R isolated (green LEDs, also red LEDs) | ||
| + | 652-4816P-1LF-56 5 6 56R isolated (blue LEDs) | ||
| + | |||
| + | Capacitors | ||
| + | 647-TVX1C471MAD 1 1 470uF electrolytic axial | ||
| + | 80-C1206C104K5R 23 50 100n ceramic 1206 | ||
| + | 647-F931C106MAA 5 10 10uF tantalum 1206 | ||
| + | |||
| + | Diodes | ||
| + | 512-BAT54 36 100 Schottky diode SO-23 | ||
| + | 512-1N4148TR 289 300 1N4148 diode | ||
| + | 78-LS4148-GS18 5 10 4148 quadroMELF | ||
| + | |||
| + | LEDs | ||
| + | 604-APTR3216ZGC 289 300 LED green 1206 reverse mount | ||
| + | 604-APTR3216QBC/D 289 300 LED blue 1206 reverse mount | ||
| + | 604-APTR3216SURCK - - LED red 1206 reverse mount | ||
| + | |||
| + | Transistors | ||
| + | 512-BC81840MTF 36 100 NPN BJT SO-23 | ||
| + | |||
| + | ICs | ||
| + | 595-SN74LVC1G17DBVR 3 10 Schmitt trigger, overvoltage tolerant SO-23-5 | ||
| + | 595-SN74HC165DR 5 10 74HC165D SOIC | ||
| + | 595-SN74HC595DR 15 20 74HC595D SOIC | ||
| + | |||
| + | Connectors | ||
| + | 523-T3507-000 1 1 DIN 8 panel connector | ||
| + | 523-T3504-001 2 2 DIN 8 plug | ||
| + | --- 2 - 2x5 DIL header male, snap from a larger piece | ||
| + | --- 1 - 2x5 IDC plug female (DIN8 <-> miniCore) | ||
| + | |||
| + | Hardware | ||
| + | --- 40cm - 10-way ribbon cable | ||
| + | --- 20 - M3 nut (stainless) | ||
| + | --- 20 - M3 washer (stainless) | ||
| + | --- 1(+4) - M2 grub screw, 14 mm (stainless) | ||
| + | --- 1(+4) - M2 nut (stainless) | ||
| + | --- 1(+4) - M2 washer (stainless) | ||
| + | --- 2 - M3 standoff, 12mm male-female | ||
| + | --- 8 - M3 standoff, 25mm (for spacing PCB during building) | ||
| + | |||
| + | Buttons | ||
| + | --- 18(19) - adafruit 4x4 silicone | ||
| + | |||
| + | Spacer | ||
| + | --- 1 - spacer cut from 3mm opaque acrylic | ||
| + | |||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== Parts notes ==== | ||
| + | |||
| + | |||
| + | * You can choose either Blue+Green LEDs (recommended) or Blue+Red. You could interchange some Green for Red. Green+Red is not recommended as the colour mixing is poor. | ||
| + | * Slider height: I specified 15mm shaft sliders, you could change these for 10mm. 15mm will protrude 13mm out of the case, which might be a bit long. 10mm will only protrude 8mm, so they would be less likely to break off and will probably be a bit more sturdy. TK. suggests 1k should work, the others are too high in resistance to get good jitter-free values (10k sliders with the shorter shaft aren't readily available). | ||
| + | * You should use the indicated panel mount DIN, but a cheaper pair of DIN8 plugs might work. | ||
| + | * M2 hardware is a bit difficult to find in normal stores, but Boltbase on eBay has good deals. | ||
| + | |||
| + | |||
| + | ==== Tools needed ==== | ||
| + | |||
| + | |||
| + | * Soldering iron, I managed with a normal tip but it’s a bit tricky with some components | ||
| + | * Solder, probably leaded. 0.5mm is strongly recommended for at least the ICs (1206 can be easily done with 1mm solder). | ||
| + | * Desoldering wick and/or solder pump. Useful when the pads get too much solder | ||
| + | * Tweezers to pick and place components | ||
| + | * Cutters for diodes and a few through hole components | ||
| + | * Good eyes or light and a loupe | ||
| + | * 2-3 small clamps | ||
| + | * Flat work surface | ||
| + | * Multimeter, test continuity between pads | ||
| + | |||
| + | ==== Dimensions ==== | ||
| + | |||
| + | Here are the dimensions for the button, hole and slider locations. Note that the unmarked mounting holes are M3 (3.2mm diameter) | ||
| + | |||
| + | {{:blm16x16_x:dimensions.png?300|}} | ||
| + | {{:blm16x16_x:dimensions.png?linkonly|}} | ||
| + | |||
| + | |||
| + | |||
mididocs/seq/blm16x16_build_guide.1459199533.txt.gz · Last modified: 2016/03/28 21:12 by latigid_on
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